Polarized Raman spectrum and normal coordinate analysis of α‐MnMoO 4

The poarized Raman spectum of α‐MnMoO 4 and the infrared spectrum of the poycrystalline material are reported. The observed bands were assigned on the basis of a normal coordinate analysis using a valences force field. Force constants of molybdate ions were examined in detail. Lattic vibrations are explained mainly in terms of MnO streching force constants. Coupling between MoO stretchings on MoO bonds of differents lengths is slight and in general a v 2 ‐like mode is higher in frequesncy than a v 4 ‐like mode. The position of oxygen atoms substituted after an oxidation reaction of an olefin by using an 18 O tracer is identified.